If you could open the nucleus of a cell and peek inside, you’d find chromosomes — the strands of DNA where genes reside. This figure helps you see how all the parts of a chromosome relate to one another.

If you could open the nucleus of a cell and peek inside, you’d find chromosomes — the strands of DNA where genes reside. This figure helps you see how all the parts of a chromosome relate to one another.
Tara Rodden Robinson, PhD, taught genetics at Auburn University and Oregon State University for almost 15 years. Lisa Cushman Spock, PhD, CGC, is a writer. She's spent much of her 20-year career as a medical researcher, clinical genomics specialist, and certified genetics counselor.